TWO wierd sounds from turbo.... - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 05-09-2007, 12:20 AM   #1
Junior Member
Thread Starter
iTrader: (1)
 
that7guy's Avatar
 
Join Date: Apr 2005
Location: Bethesda, MD
Posts: 428
Total Cats: 7
Default TWO wierd sounds from turbo....

I have some sounds that are coming from my turbo that I cant diagnose the source of. Maybe some of you guys have heard them before and fixed the problem.

Sound 1- Began after the instal of a JR high flow cat. Sounds like when you blow through a cardboard paper towel roll. Begins shortly after reaching boost and is louder then the spool of the turbine.

Sound 2- Begins when the turbo starts to spool but goes away when boosts hits at higher rpms. Arrived after the tightening of the wastegate actuator rod. sounds like a rattlesnakes tail. I have a feeling this one is the rod bouncing back between the side of the wastegate and the pin.

Any idea's? I would like to figure it out before NE dyno day on sat although I dont feel any deliverance in performance, its anoying and sounds broken.
Thanks,
7
that7guy is offline   Reply With Quote
Old 05-09-2007, 12:24 AM   #2
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

My guesses

#1 I don't understand what you mean, I can't recall ever blowing into a cardboard tube

#2 downpipe rattling against tranny or WG actuator rod end rattling between WG lever and cotter pin. I had both problems. The first I fixed when I put the tranny back in after the clutch. The second I removed the cotter pin and replaced it with a bent finishing nail.
Ben is offline   Reply With Quote
Old 05-09-2007, 01:14 AM   #3
Senior Member
 
Join Date: Jan 2007
Location: Maryland
Posts: 701
Total Cats: 0
Default

#2 Can also be fixed by just adding washers behind the arm so that it's right up against the pin.
MX_Eva is offline   Reply With Quote
Old 05-09-2007, 10:46 AM   #4
Newb
 
Join Date: Apr 2007
Posts: 40
Total Cats: 0
Default

i am having the same sounds coming from my engine bay.
aitracing-miata is offline   Reply With Quote
Old 05-09-2007, 11:27 AM   #5
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407
Default

#1 there is no sound when I blow through a tube.

unless you mean yell or raspberry.
y8s is offline   Reply With Quote
Old 05-09-2007, 03:25 PM   #6
Junior Member
Thread Starter
iTrader: (1)
 
that7guy's Avatar
 
Join Date: Apr 2005
Location: Bethesda, MD
Posts: 428
Total Cats: 7
Default

Hmm, maybe it will help if I can get some sound clips. I'm going to give the washer thing a shot later and see if that takes care of #2
that7guy is offline   Reply With Quote
Old 05-09-2007, 03:32 PM   #7
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

listen to mine, it doesnt sound like that does it? if so that's normal boost in the making....

http://youtube.com/watch?v=IxSSi80Lv8s
Braineack is offline   Reply With Quote
Old 05-09-2007, 11:37 PM   #8
Junior Member
Thread Starter
iTrader: (1)
 
that7guy's Avatar
 
Join Date: Apr 2005
Location: Bethesda, MD
Posts: 428
Total Cats: 7
Default

Heres the video, please help!

http://www.youtube.com/watch?v=UP9mb9kqUWE
that7guy is offline   Reply With Quote
Old 05-10-2007, 12:06 AM   #9
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

so wierd....did it happen before we put the BEGi in? Is it just something rattling?
Braineack is offline   Reply With Quote
Old 05-10-2007, 12:09 AM   #10
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

I heard what sounded like an exhaust rattle at one point. But that's all I heard.
Ben is offline   Reply With Quote
Old 05-10-2007, 12:12 AM   #11
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

I heard it person last week...listen for the sound that sounds like water pressurizing through an empty lawn hose....best why i can describe it. best heard at 21-25secs.
Braineack is offline   Reply With Quote
Old 05-10-2007, 12:15 AM   #12
Junior Member
Thread Starter
iTrader: (1)
 
that7guy's Avatar
 
Join Date: Apr 2005
Location: Bethesda, MD
Posts: 428
Total Cats: 7
Default

Quote:
Originally Posted by Braineack View Post
so wierd....did it happen before we put the BEGi in? Is it just something rattling?
It was doing it at the time. Remember what we thought was the wastegate rattling or something because of the bigger cat? I tightened it all the way and its still there. I might switch the cat out tomorrow with the stocker and see if the JR cat is bad. Maybe its has a leak but i dont see why it would make that noise. Other then that I'm stumped.
that7guy is offline   Reply With Quote
Old 05-10-2007, 01:13 AM   #13
Elite Member
iTrader: (14)
 
Join Date: Mar 2006
Location: Edmonton, AB
Posts: 4,921
Total Cats: 0
Default

I'm not hearing anything odd. Like ben at one point it sounds like a hi frequency rattle.
jayc72 is offline   Reply With Quote
Old 05-10-2007, 03:11 AM   #14
Junior Member
Thread Starter
iTrader: (1)
 
that7guy's Avatar
 
Join Date: Apr 2005
Location: Bethesda, MD
Posts: 428
Total Cats: 7
Default

So i might have found the problem. The shaft in the turbo has a ever so slight of play in it. Is that normal or is it not supost to move. Can i fix it or does it need to be rebuilt? basically whats my next step?

Would the turbo make sounds like this if it was oil deprived? I dont have the oil return drilled so there might be a kink in it?
that7guy is offline   Reply With Quote
Old 05-10-2007, 03:25 AM   #15
Elite Member
iTrader: (9)
 
Join Date: Aug 2006
Location: Concord, North Carolina
Posts: 4,173
Total Cats: 5
Default

most turbos ARE supposed to have a tiny bit of play until the oil gets in the bearings, then its supposed to seal up from what I understand...

But I don't understand that much so IDK.
miatamania is offline   Reply With Quote
Old 05-10-2007, 09:31 AM   #16
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

when you're turbo has enough play that the compressor blades hit the walls, it sounds like this: https://www.miataturbo.net/braineack...s/badspool.wmv

I really don't think it's the turbo per-say...

every needs to listen between 11 - 17secs., dont listen to the exhaust or the turbo spool...you'll hear a crazy rattling....then you can here it on the rest of the clips.
Braineack is offline   Reply With Quote
Old 05-10-2007, 09:42 AM   #17
:(
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

Tranny gears i dont think it is compressor blades on the wall. I had my nissan tranny **** up on me and it sounded kinda like that put in new synchros and it wass all better.
magnamx-5 is offline   Reply With Quote
Old 05-10-2007, 10:51 AM   #18
Senior Member
 
Join Date: Mar 2007
Location: Denver, CO
Posts: 564
Total Cats: 0
Default

The shaft should have some play up, down, side-to-side (axial/radial) but not back and forth (lateral). The axial movement accounts for the space the oil film will take up, lateral movement just means **** (the thrust bearing) is worn out and the compressor wheel will eventually hit the inside of the housing, if it hasn't already.
jwarriner is offline   Reply With Quote
Old 05-10-2007, 11:31 AM   #19
Elite Member
iTrader: (14)
 
Join Date: Mar 2006
Location: Edmonton, AB
Posts: 4,921
Total Cats: 0
Default

Ok, I think I heard it. Sounds like a buzzing sound that is surging a bit. What's being used as a boost controller?
jayc72 is offline   Reply With Quote
Old 05-10-2007, 02:32 PM   #20
Junior Member
Thread Starter
iTrader: (1)
 
that7guy's Avatar
 
Join Date: Apr 2005
Location: Bethesda, MD
Posts: 428
Total Cats: 7
Default

http://www.voodooboost.com/

Checked the oil return and feed and no kinks. Oil level is fine and i guess the play in the shaft is normal. Do you guys really think the noise could be from an exhaust leak?

Last edited by that7guy; 05-10-2007 at 03:00 PM.
that7guy is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Buzzing from driver side of engine bay? (MS3 install) nick470 MEGAsquirt 7 06-16-2017 02:53 PM
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 03:44 PM
"Chimney Ethanol" E100 MiataGarage Engine Performance 5 09-30-2015 12:04 AM
Are my coils failing? viriiguy General Miata Chat 5 09-28-2015 08:39 PM
Twin Walbros, one pump louder than the other patsmx5 General Miata Chat 6 09-25-2015 02:47 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 05:42 PM.